US11367762B2 - Pixel definition layer, display substrate, display device and inkjet printing method - Google Patents

Pixel definition layer, display substrate, display device and inkjet printing method Download PDF

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US11367762B2
US11367762B2 US16/337,591 US201816337591A US11367762B2 US 11367762 B2 US11367762 B2 US 11367762B2 US 201816337591 A US201816337591 A US 201816337591A US 11367762 B2 US11367762 B2 US 11367762B2
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pixel
sub
opening
definition layer
pixel definition
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US20210376017A1 (en
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Chin Lung Liao
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
    • H01L27/3246—
    • H01L27/3216—
    • H01L27/3218—
    • H01L51/0005—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/17—Passive-matrix OLED displays
    • H10K59/173—Passive-matrix OLED displays comprising banks or shadow masks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing

Definitions

  • Embodiments of the present disclosure relate to a pixel definition layer, a display substrate, a display device and an inkjet printing method.
  • Organic light emitting display devices have advantages of self-luminescence, fast response, wide viewing angle, high brightness, rich colors, thinness and so on, and therefore, the technology for the organic light emitting display devices become an important display technology.
  • the organic light emitting layer of the organic light emitting display device may be formed by an inkjet printing method, and the formation of the organic light emitting layer by the inkjet printing method requires a pixel definition layer be formed on a base substrate in advance, so as to allow ink droplets to be sprayed in a designated pixel region accurately.
  • At least one embodiment of the present disclosure provides a pixel definition layer, which comprises: a first pixel definition layer, the first pixel definition layer comprises first openings, the first openings comprise a first sub-pixel opening and a second sub-pixel opening which are corresponding to different sub-pixels; and an opening size of the second sub-pixel opening is larger than an opening size of the first sub-pixel opening; a second pixel definition layer on the first pixel definition layer, the second pixel definition layer comprises second openings, the second openings comprise a fourth sub-pixel opening corresponding to and connecting to the first sub-pixel opening and a fifth sub-pixel opening corresponding to and connecting to the second sub-pixel opening; a difference between an opening size of the fourth sub-pixel opening and the opening size of the first sub-pixel opening is larger than a difference between an opening size of the fifth sub-pixel opening and the opening size of the second sub-pixel opening.
  • the first openings of the first pixel definition layer further comprise a third sub-pixel opening having an opening size larger than the opening size of the second sub-pixel opening;
  • the second openings of the second pixel definition layer further comprise a sixth sub-pixel opening corresponding to and connecting to the third sub-pixel opening, and the difference between the opening size of the fifth sub-pixel opening and the opening size of the second sub-pixel opening is larger than a difference between an opening size of the sixth sub-pixel opening and an opening size of the third sub-pixel opening.
  • sizes of the second openings are same.
  • a material of the first pixel definition layer comprises a hydrophilic material
  • a material of the second pixel definition layer comprises a hydrophobic material
  • the hydrophilic material comprises silicon oxides or silicon nitrides
  • the hydrophobic material comprises polyimide
  • the pixel definition layer provided by at least one embodiment of the present disclosure further comprises a substrate, the first pixel definition layer and the second pixel definition layer are on the substrate; in a direction perpendicular to the substrate, a cross section of the pixel definition layer is in a stepped shape.
  • shapes of the second openings are same.
  • the pixel definition layer provided by at least one embodiment of the present disclosure further comprises a substrate, the first pixel definition layer and the second pixel definition layer are on the substrate, and in a direction perpendicular to the substrate, a cross section of at least one of the first pixel definition layer and the second pixel definition layer is in a trapezoid shape.
  • a film formed from the ink, that is provided in the openings of the first pixel definition layer and the second pixel definition layer through the inkjet printing and is dried, is in the first pixel definition layer; alternatively, the film formed from the ink, that is provided in the openings of the first pixel definition layer and the second pixel definition layer through the inkjet printing and is dried, is in the first pixel definition layer and the second pixel definition layer.
  • At least one embodiment of the present disclosure provides a display substrate, which comprises any one of the above-mentioned pixel definition layers.
  • the display panel comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, and a size of a first opening corresponding to the red sub-pixel, a size of a first opening corresponding to the green sub-pixel and a size of a first opening corresponding to the blue sub-pixel are sequentially increased.
  • FIG. 1 is a cross-sectional schematic diagram of a pixel definition layer provided by an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of a display substrate provided by an embodiment of the present disclosure.
  • FIGS. 7A and 7B are schematic diagrams of a pixel definition layer in a manufacture process provided by an embodiment of the present disclosure.
  • FIG. 8 is a flow chart of a manufacture method of a display substrate provided by an embodiment of the present disclosure.
  • the pixel definition layer usually comprise a plurality of openings of different sizes
  • the morphologies of the organic light emitting layers formed in the openings of different sizes are usually uneven, thereby causing the brightness of pixel regions of a display device to be inhomogeneous in the case where the display device emits light, and seriously affecting the display effect of an organic light emitting display device.
  • the second pixel definition layer is on the first pixel definition layer, and the second pixel definition layer comprises second openings, the second openings comprise a fourth sub-pixel opening corresponding to and connecting to the first sub-pixel opening and a fifth sub-pixel opening corresponding to and connecting to the second sub-pixel opening; a difference between the opening sizes of the fourth sub-pixel opening and the first sub-pixel opening is larger than a difference between the opening sizes of the fifth sub-pixel opening and the second sub-pixel opening.
  • At least one embodiment of the present disclosure provides a display substrate, which comprises the above-mentioned pixel definition layer.
  • At least one embodiment of the present disclosure provides a display device, which comprise the above-mentioned display substrate.
  • the size of an opening of a pixel definition layer refers to the size of the area occupied by an orthographic projection of the opening of the pixel definition layer on the substrate 100 on which the pixel definition layer is formed.
  • the size of one of the second openings of the second pixel definition layer may be, for example, larger than or equal to the size of one of the first openings of the first pixel definition layer, in which the one of the first openings is corresponding to the one of the second openings.
  • the difference between the opening sizes of the fourth sub-pixel opening 1024 and the first sub-pixel opening 1011 is larger than the difference between the opening sizes of the fifth sub-pixel opening 1025 and the second sub-pixel opening 1012 .
  • the first openings of the first pixel definition layer may further comprise a third sub-pixel opening 1013 having an opening size larger than the opening size of the second sub-pixel opening 1012 ; and the second openings of the second pixel definition layer further comprises a sixth sub-pixel opening 1026 corresponding to and connecting to the third sub-pixel opening 1013 .
  • the difference between the opening sizes of the fifth sub-pixel opening 1025 and the second sub-pixel opening 1012 is larger than the difference between the opening sizes of the sixth sub-pixel opening 1026 and the third sub-pixel opening 1013 .
  • the sizes of the plurality of second openings may be the same, for example, the opening sizes of the fourth sub-pixel opening 1024 , the fifth sub-pixel opening 1025 , and the sixth sub-pixel opening 1026 are the same.
  • ink may be provided in both the first pixel definition layer 101 and the second pixel definition layer 102 through inkjet printing. Because the sizes of the plurality of second openings in the second pixel definition layer are more similar than the sizes of the plurality of first openings, alternatively, because the sizes of the second openings are substantially the same, the surface areas of the ink, exposed in the air, provided in different sub-pixels through inkjet printing are more similar or substantially the same, and therefore the drying speeds of the ink in different sub-pixels are substantially the same, and the films obtained from the ink after the ink is dried are more uniform.
  • the thickness of the first pixel definition layer may range from 30 nm to 300 nm, for example, may be 100 nm, 150 nm, 200 nm, 250 nm, or the like.
  • the thickness of the second pixel definition layer may range from 500 nm to 2000 nm, for example, may be 600 nm, 800 nm, 1000 nm, 1500 nm or 1800 nm, or the like.
  • the shapes of the plurality of first openings may be the same or substantially the same, for example, the shapes of the first sub-pixel opening 1011 , the second sub-pixel opening 1012 , and the third sub-pixel opening 1013 are substantially the same.
  • the shapes of the plurality of second openings may be the same or substantially the same, for example, the shapes of the fourth sub-pixel opening 1024 , the fifth sub-pixel opening 1025 , and the sixth sub-pixel opening 1026 are substantially the same.
  • the orthographic projections of one of the first openings and one of the second openings on the substrate 100 are both in polygonal shapes, such as rectangular shapes or the like, and the shapes of the openings are not limited in the embodiment.
  • the cross section of the first pixel definition and the cross section of the second pixel definition layer are in trapezoidal shapes or the like.
  • rectangle shape in the embodiment of the present disclosure may be a shape of a rectangle with rectangular corners or a shape of a rectangle with rounded corners, and those skilled in the art may appreciate that the rectangle shape is a rectangular shape or a substantially rectangular shape.
  • the stepped shape, the trapezoidal shape and so on may also adopt a similar interpretation, which are not repeat here.
  • the first sub-pixel opening 1011 , the second sub-pixel opening 1012 , and the third sub-pixel opening 1013 are in rectangular shapes, and the widths of the first sub-pixel opening 1011 , the second sub-pixel opening 1012 , and the third sub-pixel opening 1013 are D 1 , D 2 , and D 3 , respectively, and the relationship between the values of the widths of the first sub-pixel opening 1011 , the second sub-pixel opening 1012 , and the third sub-pixel opening 1013 satisfies: D 1 ⁇ D 2 ⁇ D 3 .
  • the lengths of the first sub-pixel opening 1011 , the second sub-pixel opening 1012 , and the third sub-pixel opening 1013 may be the same or different, for example, in the case as illustrated in FIG. 2 , the lengths of the first sub-pixel opening 1011 and the second sub-pixel are the same, and the length of the third sub-pixel opening 1013 is slightly smaller than the lengths of the first sub-pixel opening 1011 and the second sub-pixel opening 1012 .
  • the shape of one of the second openings of the second pixel definition layer 102 may, for example, correspond to the shape of one of the first openings, for example, may be in a rectangle shape, which is also not limited in the embodiment.
  • the sizes of the plurality of second openings of the second pixel definition layer 102 are the same.
  • the fourth sub-pixel opening 1024 , the fifth sub-pixel opening 1025 , and the sixth sub-pixel opening 1026 have the same lengths and the same widths, for example, in the case as illustrated in FIG.
  • organic light emitting layers of different colors may be respectively provided in the different openings through inkjet printing, for example, inkjet printing is performed in the first sub-pixel opening 1011 , the second sub-pixel opening 1012 , and the third sub-pixel opening 1013 , respectively, so as to form a red light emitting layer, a green light emitting layer, and a blue light emitting layer.
  • the organic light emitting layer of a certain color may be selected to be inkjet printed in the pixel opening of a certain size according to factors such as: properties (such as ink viscosity, solvent volatilization rate, and so on) of the ink of organic light emitting layers of different colors; light emitting efficiencies and lifetime of organic light emitting layers of different colors; and requirements of an light emitting device on light emitting layers of different colors in brightness, and so on.
  • the blue light emitting layer may be provided in the third sub-pixel opening 1013 having a relatively large area through inkjet printing.
  • the correspondence relationship of the light emitting layers of different colors and the first openings of different sizes is not limited.
  • the number of types of the sizes of the first openings of the first pixel definition layer 101 may adopt other numbers, for example, four, six, and so on.
  • the four types of first openings of different sizes may be used to form, for example, a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, respectively.
  • the six types of first openings of different sizes may be used to form, for example, a red sub-pixel, a green sub-pixel, a blue sub-pixel, a magenta sub-pixel, a cyan sub-pixel, and a yellow sub-pixel, respectively.
  • the number of types of the sizes of the first openings of the first pixel definition layer 101 is not limited in the embodiment.
  • the material of the first pixel definition layer may comprise, for example, a hydrophilic material, and the hydrophilic material may be, for example, silicon-oxides or silicon-nitrides, such as silicon oxide, silicon nitride or the like.
  • the first pixel definition layer in the bottom layer is made of the hydrophilic material to facilitate the ink, which is provided through inkjet printing, to spread in the first openings, and facilitate the ink to form a more uniform film after the ink is dried.
  • the material of the second pixel definition layer may, for example, comprise a hydrophobic material, and the hydrophobic material may be, for example, an organic material such as polyimide, or the like.
  • the second pixel definition layer in the upper layer is made of the hydrophobic material to prevent the ink provided in the second openings through inkjet printing from flowing into adjacent sub-pixels.
  • an automatic optical detecting device in the case where inkjet printing is performed using the pixel definition layer provided by the embodiment to form an organic functional layer, for example, a white light interferometer, an automatic optical detecting device, and so on may be adopted to detect the uniformity of the formed organic functional layer.
  • the uniformity of the formed organic function is measured, for example, by detecting the percentage of the organic functional layer of which the thickness reaches the target thickness of the organic functional layer.
  • Table 1 is a table of comparison between the uniformity data of the organic functional layers in the pixel definition layer provided by an embodiment of the present disclosure and the uniformity data of the organic functional layers in a common pixel definition layer provided as a comparative example.
  • the common pixel definition layer provided as the comparative example does not comprise a second pixel definition layer, while other structures and experimental conditions of the above-mentioned two pixel definition layers are the same. It can be seen that all the uniformities of the organic functional layers, corresponding to the sub-pixels of various colors, in the pixel definition layer provided by the embodiment are improved to a certain degree, compared with the uniformities of the organic functional layers, corresponding to the sub-pixels of various colors, in the common pixel definition layer, and the uniformities of the organic functional layer corresponding to the sub-pixels of various colors are substantially the same. It can be seen that the uniformity of the organic functional layers formed by using the pixel definition layer provided by the embodiment through inkjet printing is increased.
  • At least one embodiment of the present disclosure provides an inkjet printing method using any one of the above-mentioned pixel definition layers.
  • the pixel definition layer is formed on a substrate, on which, for example, other structure layers or functional layers are formed.
  • the structure layers comprise, for example, a buffer layer, a passivation layer, and so on.
  • the functional layers comprise, for example, a driving circuit and so on, and the driving circuit comprises a gate line, a data line, a transistor, a capacitor, and so on.
  • the pixel definition layer is formed on the structure layers or functional layers. As illustrated in FIGS.
  • the inkjet printing method comprises: performing inkjet printing in openings provided by the first pixel definition layer 101 and the second pixel definition layer 102 , for example, to form an organic functional layer 103 .
  • the height of the ink that is provided in the pixel definition layer through inkjet printing is larger than the height of the first pixel definition layer.
  • one of the organic functional layers may comprise, for example, one or more of a light emitting layer, an electron injection layer, a hole injection layer, an electron transport layer, and a hole transport layer.
  • inkjet printing may be respectively performed in the first openings of different sizes and the second openings, which are connected to the first openings, of the same sizes, so as to form a red light emitting layer, a green light emitting layer, and a blue light emitting layer, and a red sub-pixel, a green sub-pixel, and a blue sub-pixel can be further formed.
  • the amount of the materials, which are provided in the openings corresponding to different sub-pixels through inkjet printing, of the organic functional layers may be selected according to factors such as the target thicknesses of the organic functional layers to be formed in the sub-pixels of different colors and the sizes of the first openings, corresponding to the organic functional layers, of the first pixel definition layer.
  • the sub-pixels with the sizes of the first openings in the sub-pixels being sequentially increased, are respectively provided with a red light emitting layer, a green light emitting layer, and a blue light emitting layer through inkjet printing, and the target thicknesses of the red light emitting layer, the green light emitting layer, and the blue light emitting layer to be formed are sequentially decreased, for example, the amount of the materials, which are provided through inkjet printing, of the light emitting layers may be selected according to the sizes of the first openings corresponding to the sub-pixels of various colors, and the target thicknesses of the light emitting layers to be formed.
  • the amount of the materials, which are provided in the first openings and the second openings corresponding to the sub-pixels of different colors through inkjet printing, of the organic functional layers can be adjusted according to demands, and the embodiment is not limited in this aspect.
  • the thickness of the ink is decreased after the solvent of the ink which is provided through inkjet printing is evaporated, for example, the film formed by the ink, which is provided in openings of the first pixel defining layer 101 and the second pixel defining layer 102 through inkjet printing and is dried, is in the first pixel definition layer 101 .
  • the first pixel definition layer 101 comprises first openings of different sizes, the surface areas of the functional layers formed in the sub-pixels of different colors are different.
  • a film formed from the ink provided in openings of the first pixel defining layer 101 and the second pixel defining layer 102 through inkjet printing after the ink is dried may also be, for example, in the first pixel definition layer 101 and the second pixel definition layer 102 .
  • the sizes of the plurality of second openings in the second pixel definition layer are more similar than the sizes of the plurality of first openings, alternatively, because the sizes of the second openings are substantially the same, the surface areas of the functional layers formed in the second openings of the sub-pixels of different colors may be more similar or substantially the same, while the surface areas of the functional layers formed in the first openings may be different.
  • the embodiment does not limit the formation positions of the organic functional layers formed by inkjet printing.
  • inkjet printing is performed by the inkjet printing method provided by the embodiment, because ink is provided in both the first pixel definition layer and the second pixel definition layer through inkjet printing, and also because the sizes of the plurality of second openings in the second pixel definition layer are more similar than the sizes of the plurality of first openings, alternatively, also because the sizes of the second openings are substantially the same, the surface areas of the ink, exposed in air, provided in different sub-pixels through inkjet printing are more similar or substantially the same, and therefore the drying speeds of the ink in the different sub-pixels are substantially the same, and the films obtained from the ink in the different sub-pixels after the ink is dried are more uniform.
  • the display substrate comprises any one of the above-mentioned pixel definition layers.
  • the pixel defining layer is formed on a substrate, on which other structure layers or functional layers are formed.
  • the structure layers comprise, for example, a buffer layer, a passivation layer, and so on.
  • the functional layers comprise, for example, a driving circuit and so on, and the driving circuit comprises a gate line, a data line, a transistor, a capacitor, and so on.
  • the pixel definition layer is formed over the structure layers or the functional layers.
  • the display substrate further comprises organic functional layers, the organic functional layers are formed in the plurality of sub-pixel regions obtained by connecting the plurality of first openings and the plurality of second openings in one-to-one correspondence.
  • the organic functional layer comprises one or more of a light emitting layer, an electron injection layer, a hole injection layer, an electron transport layer, and a hole transport layer, for example, for forming an organic light emitting diode device.
  • the morphologies, thicknesses, and so on of the one or more functional layers of the display substrate are more uniform, so that the display brightness uniformity of the display substrate is increased, and therefore the display quality is increased.
  • the display substrate may comprise, for example, sub-pixel units of a plurality of colors, for example, the display substrate may comprise three types pf sub-pixel units including a red sub-pixel 1041 , a green sub-pixel 1042 , and a blue sub-pixel 1043 , and the sizes of the first openings which are corresponding to the red sub-pixel pixel 1041 , the green sub-pixel 1042 , and the blue sub-pixel 1043 , of the pixel definition layer may be, for example, sequentially increased.
  • the correspondence relationship between the red sub-pixel 1041 , the green sub-pixel 1042 , and the blue sub-pixel 1043 and the first openings of different sizes may be adjusted, for example, according to factors such as properties (such as ink solubility, solvent type, and so on) of the ink of light emitting layers of different colors, light emitting efficiencies and lifetime of light emitting layers of different colors, and requirements of the light emitting device on the light emitting layers of different colors in brightness, and so on, and the embodiment is not limited in this aspect.
  • the display substrate may comprise other functional layers and structure layers, such as a pixel driving circuit for driving the organic light emitting diode device, an anode layer, a cathode layer, a planarization insulating layer, and so on, and no further description will be given in the embodiment.
  • a pixel driving circuit for driving the organic light emitting diode device an anode layer, a cathode layer, a planarization insulating layer, and so on, and no further description will be given in the embodiment.
  • At least one embodiment of the present disclosure provides a manufacture method of a pixel definition layer. As illustrated in FIG. 6 , the method comprises steps S 101 -S 102 .
  • a substrate Before performing the above-mentioned manufacture method of a pixel defining layer, a substrate is provided first.
  • the substrate may be a normal glass substrate, a plastic substrate, and so on, and other structure layers or functional layers may be formed on the substrate, for example, the structure layers comprise a buffer layer, a passivation layer, and so on.
  • the functional layers comprise, for example, a driving circuit and so on, and the driving circuit comprises a gate line, a data line, a transistor, a capacitor, and so on.
  • the pixel definition layer may be formed on the above-mentioned structure layers or functional layers.
  • Step S 11 forming a first pixel definition layer.
  • forming the first pixel definition layer 101 comprises: forming a plurality of first openings, which are corresponding to different sub-pixels, of different sizes in the first pixel definition layer 101 ′.
  • the first pixel definition layer 101 may be formed by a photolithography method, and the photolithography method comprises, for example: depositing a first material film, coating a photoresist layer, exposing the photoresist layer, developing the photoresist layer to obtain a photoresist pattern, etching the first material film using the photoresist pattern, and so on.
  • the shape of one of the first openings may be, for example, a rectangular shape or other suitable shapes.
  • three types of first openings of different sizes may be formed in the first pixel definition layer 101 , for example, a first sub-pixel opening 1011 , a second sub-pixel opening 1012 , and a third sub-pixel opening 1013 , of which sizes are sequentially increased, are formed.
  • a first sub-pixel opening 1011 a first sub-pixel opening 1011
  • a second sub-pixel opening 1012 a third sub-pixel opening 1013
  • the second pixel definition layer 102 is formed on the first pixel definition layer 101 , and the shapes of the second openings formed in the second pixel definition layer 102 may, for example, correspond to the first openings, and the shapes of the second openings, for example, are rectangular shapes or other suitable shapes.
  • the second pixel definition layer 102 may also be formed by a photolithographic method.
  • the plurality of second openings which are corresponding to different sub-pixels, of the same size are formed in the second pixel definition layer 102 , and the plurality of first openings in the first pixel definition layer 101 and the second openings in the second pixel definition layer 102 are connected in one-to-one correspondence.
  • the material of the second pixel definition layer may be a hydrophobic material, for example, the hydrophobic material may be polyimide and so on.
  • the thickness of the formed second pixel definition layer ranges from 500 nm to 2000 nm, for example, the thickness is 600 nm, 800 nm, 1000 nm, 1500 nm, 1800 nm, and so on.
  • the second pixel definition layer on the upper layer comprises the hydrophobic material to prevent the ink provided in the second openings through inkjet printing from flowing into adjacent sub-pixels.
  • At least one embodiment of the present disclosure provides a manufacture method of a display substrate. As illustrated in FIG. 8 , the method comprises steps S 201 -S 202 .
  • Step S 201 forming a pixel definition layer.
  • the pixel defining layer formed in the embodiment is any one of the pixel definition layers provided by the above-mentioned embodiments of the present disclosure.
  • the organic functional layer formed by inkjet printing in the first openings of the first pixel definition layer and the second openings of the second pixel definition layer of the pixel definition layer may comprise, for example, one or more of a light emitting layer, an electron injection layer, an hole injection layer, an electron transport layer, and an hole transport layer, and the embodiment is not limited in this aspect.
  • an organic light emitting diode device comprises an anode, a light emitting layer, and a cathode that are sequentially stacked (for example, which are stacked from top to bottom or vice versa), or may comprise an anode, a hole injection layer, a light emitting layer, an electron injection layer, and a cathode that are sequentially stacked, or may comprise an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron injection layer, an electron transport layer, a cathode and so on that are sequentially stacked.
  • sub-pixels of a plurality of colors may be formed in the display substrate; for example, three sub-pixels of three different colors, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel, are formed.
  • the correspondence relationship between the sub-pixels of different colors and the first openings of different sizes may be adjusted, for example, according to factors such as properties (such as ink solubility, solvent type, and so on) of the ink of different light emitting layers of different colors, light emitting efficiencies and lifetime of organic light emitting layers of different colors, and requirements of the light emitting device on light emitting layers of different colors in brightness, and so on.
  • the red light emitting layer can be provided in the first sub-pixel opening having a small area through inkjet printing.
  • the correspondence relationship between the light emitting layers of different colors and the first openings of different sizes is not limited.
  • the amount of the materials, which are provided in different sub-pixels through inkjet printing, of the organic functional layer materials may be selected according to factors such as the target thicknesses of the organic functional layers to be formed in the sub-pixels of different colors, the sizes of the first openings, corresponding to the organic functional layers, of the first pixel definition layer, and so on.
  • the sizes of the which are sequentially increased, in the first pixel definition layers are respectively provided with a red light emitting layer, a green light emitting layer, and a blue light emitting layer through inkjet printing, and the target thicknesses of the red light emitting layer, the green light emitting layer, and the blue light emitting layer which are to be formed are sequentially decreased, for example, the amount of the materials, which are provided through inkjet printing, of the organic functional layers may be selected according to the sizes of the first openings corresponding to the sub-pixels of the colors and the target thicknesses of the light emitting layers to be formed in the first openings.
  • the amount of the materials, which are provided through inkjet printing, of the organic functional layers in the first openings and the second openings which are corresponding to the sub-pixels of different colors may be adjusted according to demands, and the embodiment is not limited in this aspect.
  • the manufacture method of the display substrate may further comprise steps of forming other functional structures such as a pixel driving circuit, an anode layer, a cathode layer, a planarization insulating layer, and so on, which are not further described in the embodiment.
  • the morphologies, thicknesses, and so on of the organic functional layers of the display substrate are more uniform, so that the display brightness uniformity of the display substrate is increased, and therefore the display quality is increased.

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PCT/CN2018/103584 WO2019105084A1 (fr) 2017-11-30 2018-08-31 Couche de définition de pixels, substrat d'affichage, dispositif d'affichage et procédé d'impression à jet d'encre

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JP6881535B2 (ja) 2019-09-26 2021-06-02 セイコーエプソン株式会社 画像光生成モジュール及び画像表示装置
CN110600532B (zh) * 2019-11-13 2020-02-18 京东方科技集团股份有限公司 显示面板和显示装置
CN111276635B (zh) * 2020-02-14 2023-04-07 合肥京东方卓印科技有限公司 有机发光显示面板及其制作方法、显示装置
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CN113097259B (zh) * 2021-03-22 2022-06-10 深圳市华星光电半导体显示技术有限公司 一种显示面板、显示面板制程方法及显示装置
CN113437125B (zh) * 2021-06-24 2023-07-28 合肥京东方卓印科技有限公司 一种像素界定层、显示基板及显示装置

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CN109860223A (zh) 2019-06-07
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